Twenty-eight-year-old Koshiro Saeki, who lives with his father Zenzo, is dumped by his girlfriend Shoko of two years, who claims he was too cold and she had found someone else.

While on a train the morning after, he sees high school student Nanoka Kohinata looking at a button and crying.

As they leave the park together, having enjoyed the outing and expecting to part and never meet again, they run into their father and are shocked to discover they are siblings.

In near desperation, he moves out of the family home to remove himself from temptation and attempts to keep his coworker, Kaname Chidori, from finding out the truth behind his brusqueness with Nanoka.

However, the solution is only temporary, as Nanoka begins visiting Koshiro regularly, cooking him meals and spending time with him.

Written and illustrated by Motoi Yoshida, Koi Kaze was serialized in Kodansha's seinen manga magazine Evening from the September 2001 to the 2004.

[5] A 13-episode anime television series by Geneon Entertainment and Rondo Robe and directed by Takahiro Omori, was broadcast on TV Asahi from April 1 to June 17, 2004.

A full-size version of the series ending theme, "Futari Dakara" was released to CD single by Masumi Itō on May 26, 2004.

Instead, Koi Kaze deserves the highest marks possible for its thoughtful, honest, and mature handling of such a difficult and controversial issue."

[1] "Koi Kaze is not a reassuring show, but if it skirts the edge of disaster instead of plunging in, it may offer warmth to lonely, troubled people, and that's worth a lot."